Slow-Speed Bearing Fault

by Tom Dominowski


This short case history does a good job of illustrating the power of enveloping and high frequency techniques at identifying bearing defects even on very slow turning equipment. The Peakvue brand of enveloping technique was used successfully by the author in detecting an outer race defect on a slow-turning (47 rpm) trunion bearing.


“During routine monitoring a change was noted in one of the trunion bearings of a sand blending drum. The bearings are Dodge 4 15/16 special duty. A spectrum plot provided no information (Figure 1). Peakvue® showed a definite change close to the outer race defect frequency (Figure 2). The peak did not exactly line up according to the numbers supplied by the manufacturer.”

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